Sources within Comcast tell us that the company has decided to stop offering Sprint Pivot wireless service to new and existing customers starting this week, though an official announcement has yet to be made. According to an internal Comcast announcement, Pivot customers should begin receiving an e-mail by the end of April or May offering them the option to transition to traditional Sprint phone service without an early termination fee.

The Pivot brand is a coalition between Sprint, Cox, Time Warner Cable, Advance/Newhouse and Comcast that allowed cable customers to purchase rebranded wireless service. For $15-$25 (on top of a traditional Sprint mobile plan) the service provided cable customers mobile video content, email access and web browsing.

But selling the system to consumers has been a real problem, and both Sprint and Comcast execs had been publicly airing complaints. Comcast's CEO admitted there was limited consumer interest, while Sprint complained that the cable operators weren't pushing the service very hard. Last November, any new expansion of the program was put on hold, and now it appears the idea could be facing a death blow.

Comcast offered Pivot in select markets across Connecticut, Southern New Hampshire, Massachusetts, Portland, Oregon and Southwestern Washington State. According to insiders, Comcast hopes to have the migration finished by the end of the summer. What few Pivot customers there are will receive a "one month free promotion for monthly recurring voice and data plans," insiders tell us.

Update: The Associated Press this afternoon reports that Cox and Time Warner Cable are also pulling out of the Pivot program.